Chief Quartermaster, Army of the Potomac. Ingalls was born in the village of Denmark what is now Maine (at the time, it was a part of Massachusetts). His father Cyrus was a prominent local mill owner and politician who was among those at the Maine constitutional convention in 1819. Through his father's political connections, Rufus Ingalls was appointed to the United States Military Academy, graduating in the Class of 1843, which included his friend Ulysses S. Grant. Ingalls was breveted as a Second Lieutenant and assigned to garrison duty in the western frontier.